docs: def complete(self, table_name, key):
          """
          Log a completed job.  When a job is completed, its reservation entry is deleted.
          :param table_name: `database`.`table_name`
          :param key: the dict of the job's primary key
          """
          job_key = dict(table_name=table_name, key_hash=key_hash(key))
          (self & job_key).delete_quick()